Senior Frontend Engineer - Growth Experimentation

About EucalyptusOur mission is to make good health last a lifetime. With over 1 billion individuals globally living with obesity, we aim to tackle preventable chronic conditions and enhance long-term care.Eucalyptus is the driving force behind Juniper, one of the largest weight-management programs worldwide. We integrate GLP-1 medication with personalized nutrition, movement support, and clinician-led care from a diverse team of prescribers, nurses, health coaches, pharmacists, and dietitians. Our published clinical research indicates that our combined clinical and behavioral approach enables patients to achieve significantly greater weight loss during their treatment with Juniper, yielding results four times more effective.Our Growth Story:130% year-over-year revenue growth and a 90% reduction in cash burn, with over $100M raised from notable investors including BOND, NewView, Blackbird, and Airtree.Successfully supported over 350,000 patients facing obesity across our five markets.Received prestigious NICE endorsement to provide services to the NHS.Customized our offerings for thousands of patients in Germany and Japan.Drive Frontend Innovation and Shape Patient ExperiencesAt Eucalyptus, our goal is to simplify, secure, and enhance healthcare accessibility. Patients often encounter challenges navigating care, which is why our Growth squad is dedicated to creating impactful frontend web experiences that drive critical metrics such as retention, engagement, and conversions while enhancing the overall patient journey.Your contributions will be pivotal in experimenting with the frontend platform, designing and testing features that directly affect patient engagement with our services. This role presents an exciting opportunity to innovate and influence the future of healthcare delivery.

Join our dynamic team as a Senior Frontend Engineer at AECOM, where you will be at the forefront of developing innovative web applications and user interfaces. We are looking for an enthusiastic engineer with a passion for crafting seamless and engaging digital experiences. You will collaborate with cross-functional teams to design and implement robust solutions that enhance user interaction and satisfaction.

Join us at elasticstage as a Senior Frontend Engineer and play a crucial role in revolutionizing the music industry. Our innovative technology enables the production of on-demand vinyl records, providing a platform for music creators to effortlessly create and sell their music worldwide at no cost. We collaborate with top record labels, streaming services, digital providers, distributors, and renowned global artists to deliver a comprehensive solution for physical media. Our mission is to empower small and emerging artists, offering them seamless access to market their vinyl and CDs to fans through our state-of-the-art production and fulfillment centers across Europe, the USA, and Asia.The vinyl market has experienced consistent growth of over 20% annually for the past 16 years, and CDs are witnessing a resurgence for the first time in two decades. By 2030, we anticipate nearly 200 million music creators globally, with AI further accelerating this growth. Many artists aspire to have their music available on vinyl or CD for their friends, family, and fans, and our scalable on-demand technology makes this accessible without the burden of high costs or minimum orders. At elasticstage, we provide easy and affordable access to this burgeoning market.As a Senior Frontend Engineer, you will take ownership of our front-end platform, engaging in hands-on development while providing technical leadership and direction. You will collaborate closely with product, design, and backend engineering teams to deliver exceptional user experiences across our e-commerce platform, creator tools, and operational systems.Join us and contribute to scaling a dynamic, high-profile disruptor in the music industry!

TransPerfect is seeking a Senior Frontend Engineer to join its London-based team. This position plays a key role in developing and maintaining software products that support global operations. The focus is on delivering high-quality, reliable solutions that drive the company’s technology forward. Role overview The Senior Frontend Engineer will work on the design, development, and execution of software products. This includes taking responsibility for the quality of the user interface and ensuring that products meet both technical and user needs. The role involves collaborating with other teams to deliver solutions that support TransPerfect’s worldwide business. About the TechOps team TechOps has supported TransPerfect’s growth for more than ten years. The team builds and maintains technology that streamlines processes for both clients and internal teams. Projects range from workflow improvements to developing scalable interfaces for the GlobalLink platform, all aimed at making complex systems easier to use. What you will do Lead frontend development for software products used across global operations Ensure the quality and reliability of user interfaces Work closely with cross-functional teams to deliver scalable solutions

Location: London Start date: Immediate The Role: We are seeking exceptionally skilled and motivated software engineers who take pride in their craft to enhance our Engineering team based in London. As a successful candidate, you will collaborate within a cross-functional team that includes product managers and designers, working closely with the wider business to deliver effective code that addresses real-world challenges for both internal and external clients. You will take charge of the services overseen by your team, ensuring their development aligns with the overarching AlphaSights Engineering strategy, while also mentoring junior engineers. If you are passionate about problem-solving through coding and aspire to work alongside outstanding colleagues in a high-achievement environment, this position is ideal for you. What You’ll Do: Design Solutions: Define optimal technical solutions to business problems, contributing to a scalable architectural vision that aims to become the world's leading research platform. Ship Working Code: Our primary tech stack consists of React for the frontend and Kotlin microservices with Postgres for the backend, alongside some legacy services built in Ruby on Rails. We continually assess new technologies that could enhance our stack. Deploy and Iterate: We release updates frequently to our customers, utilizing CircleCI and Spinnaker for CI/CD, gathering feedback promptly to inform subsequent iterations. Build Your Competency: You will rapidly advance your skills by developing market-leading technology alongside experienced colleagues in a high-performance environment. Engineers can also utilize our L&D budget to accelerate their development of specific technical competencies. Maintenance and Troubleshooting: Diligently monitor our services to catch errors proactively, diagnose root causes, and deploy fixes before users are affected. Who You Are: You likely hold a degree in a STEM subject, but we are also open to candidates who have honed their skills through alternative pathways. Experience: Proven experience at a similar level within a mature Engineering team, with aspirations to elevate your career. We seek individuals with outstanding potential. Technical Expertise: Extensive knowledge in frontend engineering, including designing, building, and maintaining robust web applications.

Senior Data Scientist - ExperimentationBecome a pivotal part of our journey to revolutionize how people shop and dine, with a focus on impact, innovation, and growth. Our Analytics team is central to Deliveroo, enabling informed decision-making across product, commercial, and operational aspects through rigorous experimentation, causal inference, and advanced machine learning techniques.We nurture a vibrant Analytics community, featuring guest lectures, study groups, mentorship programs, and a comprehensive technical review process.Our data scientists come from diverse backgrounds but share a commitment to excellence.We are on the lookout for a Senior Data Scientist to join our London team, with a hybrid work model requiring 3 days in the office. In this capacity, you will empower high-quality, human-led decision-making to maximize our impact.Your ResponsibilitiesAs a Senior Data Scientist at Deliveroo, your primary objective will be to optimize business impact within one of our product domains. A significant aspect of your role will involve designing, executing, and interpreting experiments, along with utilizing causal inference to inform product decisions in complex real-world environments.You will delve deeper than merely answering whether a feature was successful; your focus will be on uncovering the genuine impact, understanding the reasons behind the outcomes, and how results can be applied across various users, markets, and timelines.Here’s a glimpse into your day-to-day activities:Strategic Insights through Experimentation: Spearheading the design of both straightforward and intricate experiments, proactively translating insights into strategic initiatives.Expertise in Causal Inference: Employing sophisticated techniques to assess long-term and varied treatment effects.Deriving Trustworthy Conclusions: Navigating settings with selection bias or imperfect randomization.Generating In-depth Product Insights: Identifying fundamental factors influencing experiment performance, understanding why features thrive, and how results can be generalized across different users, markets, and timelines.Utilizing insights from previous experiments to enhance future decision-making.Your QualificationsProven experience in designing, implementing, and interpreting A/B experiments within production environments.Robust understanding of causal inference concepts.Capacity to apply statistical reasoning to complex real-world product challenges.

blp-digital is looking for a Senior Frontend Engineer to work onsite in London. This role centers on building modern web applications, working closely with both designers and backend developers to deliver user experiences that are intuitive and reliable. Key responsibilities Lead the frontend development of both new and existing web applications Collaborate with designers to turn concepts into polished, effective interfaces Work with backend engineers to ensure seamless integration between frontend and backend systems Work location This position requires working onsite at the London office.

Senior Frontend Engineer - Elevate User Experiences Are you a seasoned Frontend Engineer looking to make a significant impact? Join our dynamic and agile delivery team at ClearScore, where we are dedicated to crafting innovative experiences for our users through the latest technologies. If you thrive in a high-performance, entrepreneurial environment that celebrates the art of developing cutting-edge products and tackling complex challenges, we want to hear from you! As a valued member of our established cross-functional squad, you will focus on advancing our design system, enhancing our logged-out website, and exploring other groundbreaking technologies. We foster a culture of continuous improvement and creativity, inviting new team members to share their ideas and methodologies. Bring your expertise, and we'll share our knowledge in a collaborative and enjoyable atmosphere. At ClearScore, our world-class engineers are pivotal in fulfilling our mission to enrich the financial lives of millions. To learn more about our technology stack, visit our 2026 Tech Radar. Discover our work culture through our Behavioural Principles and Engineering Principles. Explore additional insights on our Tech Blogs on Medium. Your Responsibilities: Design, develop, and maintain full-stack solutions using Node.js and TypeScript, delivering data-driven user interfaces and backend services. Create intuitive client UX utilizing design systems and server-driven UI frameworks. Optimize and scale databases for large-scale applications, employing SQL, PostgreSQL, and indexing strategies to ensure performance and maintainability. Collaborate closely with skilled colleagues to implement, monitor, and optimize real-time data pipelines with Kafka, ensuring robust message handling and distributed system performance to enhance your features. Take ownership of end-to-end performance optimization, both client-side and server-side. Lead the deployment and maintenance of production-grade code and databases across multiple global markets. Monitor post-release performance, utilizing tools for reliability and system health. Engage in an Agile environment, mentoring team members across various specializations and fostering a culture of learning and continuous improvement.

Join our passionate team at Ledger, where we are dedicated to redefining the landscape of digital ownership. Our mission is to empower users, creators, and enterprises to take control of their value with unparalleled freedom through technology that is accessible to everyone. We thrive on innovation, fostering a culture of curiosity and problem-solving that encourages every team member to challenge norms and develop groundbreaking solutions. At Ledger, we are committed to making self-custody accessible, giving individuals the keys to their financial futures. If you’re eager to make a significant impact, we invite you to become part of our journey.As the leading global platform for digital assets and Web3, Ledger secures over 20% of the world’s crypto assets through our advanced hardware wallets, with more than 7.5 million units sold across 200 countries. With headquarters in Paris and offices in various locations including London, we employ around 600 skilled professionals dedicated to developing secure products and services that allow individuals and businesses to manage their crypto assets with confidence.The TeamYou will be an integral part of the E-commerce Engineering team, which is responsible for the entire customer experience on ledger.com. This team oversees the customer journey from discovery to checkout, utilizing a modern technology stack (Next.js, Shopify, Contentful, Vercel) to deliver high-performance, conversion-optimized experiences.In our dynamic, product-focused environment, we prioritize frequent deliveries and continuous optimization in performance, SEO, and conversion rates.What You’ll Be DoingAs a Senior Frontend Engineer, you will play a pivotal role in shaping the web experiences that millions of customers rely on. This hands-on position involves significant ownership, where you will lead complex projects from conception through to production, influence technical direction, and uplift team standards through mentorship.Your responsibilities will include:End-to-End Project OwnershipLead the development of impactful features from inception to deployment.

About the RoleWe are excited to announce an opening for a Senior Frontend Engineer who will take charge of the user interface layer of ThreatAware's dynamic platform. Your main responsibilities will include developing the dashboard, enhancing data visualization, and crafting interfaces for our innovative AI-powered features. You will be working with TypeScript using Angular and React, reporting directly to the Head of Engineering, and collaborating closely with our R&D teams to seamlessly integrate AI functionalities into our platform. If you have a passion for creating stunning interfaces, an eye for detail, and a desire to tackle complex UI challenges with significant real-world implications, this position is perfect for you.Why Join ThreatAware?At ThreatAware, we provide security teams with a comprehensive source of truth for every device and tool within their organization. With over 150 integrations, rapid deployment in under 30 minutes, and real-time visibility across entire IT infrastructures, we have earned the trust of sectors such as finance, legal, energy, and healthcare. We're on a mission to build something even more impactful. After six years of curating accurate cyber asset data, we are now integrating AI to offer new methods for security teams to analyze their data, automate workflows, and proactively manage risks before they escalate. In this role, you will design intuitive interfaces that enhance user experience.Your ResponsibilitiesTake ownership of the frontend that transforms intricate security data into clear insights.Design and develop the platform dashboard and AI workspace UI using TypeScript (Angular and React) — ensuring a data-rich, real-time experience used daily by enterprise security teams.Tackle challenging visualization problems: managing thousands of security events, device interconnections, and AI-driven insights without overwhelming users.Establish a robust component architecture, design systems, and frontend standards that evolve as the team and product expand.Collaborate closely with R&D to translate AI capabilities into user-friendly, polished interfaces.Partner with product and design teams to define and enhance the user experience, rather than just executing it.Mentor junior frontend engineers and elevate the quality of frontend development within the team.Qualifications We SeekExtensive experience with TypeScript, Angular, and React, with a deep understanding of component architecture, state management, and performance optimization.A strong aesthetic sensibility, with a commitment to creating beautiful interfaces and a keen awareness of modern design trends, paying close attention to the details that contribute to a polished product.Proven track record in building data-intensive, high-performance web applications, ideally those that involve real-time data or complex visualizations.Ability to work in a collaborative environment and effectively communicate ideas and solutions.Prior experience in mentoring and guiding junior team members is a plus.

TransPerfect is searching for a Senior Frontend Engineer to join its London team. This role centers on building and refining software products that support both internal operations and client-facing solutions. The Senior Frontend Engineer will help guide development, quality, and delivery across a range of projects. The work involves collaborating with a global team to improve user experiences and streamline complex workflows. TransPerfect’s TechOps group has supported the company’s growth for over ten years, focusing on technology and services that make processes simpler for users and clients alike. Role overview Lead and contribute to the development of frontend features for software products Oversee quality and execution throughout the product lifecycle Work closely with international colleagues to deliver scalable solutions What we look for Experience in frontend engineering at a senior level Ability to collaborate within a global, cross-functional team Interest in improving both internal and client-facing systems This position is based in London and offers the chance to contribute to a company that values innovation and practical problem-solving.

Title: Landing Page Optimization and Experimentation ManagerLocation: Hybrid – 3 days per week in our London office near Tower HillPosition: Permanent About PetLabCo….PetLabCo. is the leading direct-to-consumer provider of pet supplements, boasting a remarkable 9-figure revenue and experiencing rapid growth with ambitious global expansion plans. With over 5 million satisfied dogs and a devoted community of pet owners, we are committed to enhancing the lives of pets through our innovative products. Our vibrant team thrives in a fast-paced, customer-centric environment where high performers are recognized and rewarded, making it the perfect place for driven animal lovers eager to advance their careers. A Day In The Life…In our dynamic environment, curiosity, initiative, and a proactive spirit are highly valued. If you relish a variety of tasks, enjoy taking ownership, and aspire to make a significant impact, you’ll fit seamlessly into our pack. Reporting to the Head of Product and Optimization, you will collaborate closely with our Director of Creative Strategy, Media Buying, and Head of Copywriting to develop and implement high-performing landing page strategies, utilizing a test-and-learn methodology to continuously enhance results.Your role will involve improving efficiency across our technology stack, teams, and workflows, ensuring that ideas transition swiftly from insight to execution. A key focus will be on creating and perpetually refining landing experiences that resonate with our website visitors, emphasizing copy and content relevance. Much of your work will support paid media channels, necessitating a strong grasp of the full end-to-end user journey.No two days will be alike. From identifying opportunities within performance data to launching new experiments and delivering impactful landing pages, you will play a crucial role in driving growth. This position integrates creativity, problem-solving, analytical thinking, data storytelling, project management, and effective communication, allowing you to learn quickly, test new concepts, and witness the direct results of your efforts. Your daily responsibilities will include… Continuously monitoring and analyzing growth metrics and campaign performance, transforming data into actionable insights and innovative ideas that unlock new optimization opportunities.Engaging deeply with the strategic processes of our media buying and PPC teams, collaborating closely to launch high-quality landing pages that align with campaigns, respond swiftly to changing marketing demands, and deliver engaging user experiences.Leading multiple landing page initiatives from concept through to launch, ensuring quality and alignment with overall objectives.

About UsPerk, formerly known as TravelPerk, is an innovative platform specializing in travel and spend management. Our mission is to eliminate the tedious manual tasks that hinder productivity, automating everything from travel bookings to expense management and invoice processing. By addressing the inefficiencies that cost organizations significant time and resources, we empower businesses to focus on what truly matters.Trusted by over 10,000 companies globally, including industry leaders like Wise, On Running, Breitling, and Fabletics, we tackle the staggering 7 hours of lost productivity each week per employee, a $1.7 trillion issue.Founded in 2015, Perk has rapidly expanded to a team of more than 1,800 talented individuals across 12 offices worldwide, with headquarters located in both London and Boston. Our blend of innovation, control, and simplicity is transforming workplace dynamics and enhancing employee satisfaction.At Perk, our culture is driven by core values such as ownership, delivering exceptional experiences, and fostering teamwork. We emphasize curiosity, purpose, and a growth mindset to unlock your full potential. Our diverse talent team hails from the travel and SaaS sectors, representing over 70 countries. If you’re passionate about making a meaningful impact and reshaping the work experience for millions, we invite you to join us.Discover more at www.perk.com.

Join Mixcloud as a Senior Growth Engineer and be instrumental in driving our growth strategy through innovative engineering solutions. You will collaborate with cross-functional teams to design and implement scalable growth initiatives that enhance user acquisition and retention.

TL;DRJoin Deducta, a rapidly growing startup dedicated to addressing critical data challenges for some of the world's largest enterprises. With substantial funding and a commitment to innovation, we are positioned at the forefront of data intelligence.We seek a Senior Frontend Product Engineer to significantly influence our product's design and functionality. Your primary responsibilities will include:Delivering high-quality code swiftly across various frontend functionalities.Pioneering the integration of Large Language Models (LLMs) to enhance or replace traditional user interfaces. Location: London, UK. We encourage in-person collaboration within our office located near London Bridge. Compensation: Total remuneration for this position exceeds £150k. Visas: We provide visa sponsorship for the ideal candidate. Start Date: As soon as possible. About DeductaDeducta is a pioneering data intelligence platform catering to global enterprises. Our mission is to offer unparalleled insights into mission-critical data, beginning with spend data, to support significant business transformations.Our partners leverage Deducta to achieve impactful results at an unprecedented pace. Role OverviewOur deployment of cutting-edge LLMs for language analysis has empowered us to tackle customer challenges at scales and accuracies previously deemed impossible.As a Senior Frontend Product Engineer, you will shape the product's design and collaborate with a dedicated team to execute swiftly and efficiently.Key Responsibilities:Conceptualize, prototype, and develop new experiences within the Deducta application, including the integration of LLMs to enhance traditional interfaces.Utilize existing design components and innovate new ones.Create and present your design and product architecture suggestions while providing constructive feedback to peers.Produce high-quality, thoroughly tested pull requests, and review designs and code from colleagues.Maintain a strong focus on user satisfaction throughout all development stages.Success in this role entails:Consistently delivering high-quality outcomes across various responsibilities, from design inception to feature rollout. Ideal Candidate ProfileWe seek a seasoned engineer with over 5 years of experience, a solid foundation in JavaScript, the ability to identify challenges, and the drive to take ownership from proposal to production, all while contributing to a market-leading product.You may be the perfect fit if you possess:Experience with Vue.js, Tailwind CSS, and Tanstack.A proven track record of writing clear, maintainable code in a collaborative environment.A strong understanding of design fundamentals, not merely the aesthetic elements.

Role overview Deliveroo is looking for a Senior Frontend Software Engineer to help shape the future of its platform. This role focuses on building high-quality user experiences and working closely with teams across the company. What you will do Develop and maintain frontend features for Deliveroo’s applications Collaborate with engineers, designers, and product managers to deliver seamless user experiences Apply expertise in modern web technologies to create engaging, reliable interfaces Location This position is based at Deliveroo’s London headquarters in The River Building.

We are seeking a talented and experienced Senior Frontend Engineer to join our dynamic team at Pigment. In this role, you will have the opportunity to work with cutting-edge technologies and contribute to the development of innovative solutions that drive our business forward.Your responsibilities will include collaborating with cross-functional teams to design and implement user-friendly interfaces, optimizing application performance, and ensuring the highest quality standards in our products.

Role Overview Airwallex is building the next generation of payments and financial services for businesses worldwide. The Senior Frontend Engineer on the Scale Team helps shape products used by more than 200,000 businesses, including well-known names like Brex and Qantas. What You Will Do Build and improve frontend solutions for Airwallex’s multi-tenant infrastructure Deliver high-performance features that meet enterprise standards Work closely with engineers, product managers, and designers to launch new features Tackle complex engineering challenges as part of a collaborative team Who We’re Looking For Experienced frontend engineer with a strong background in building scalable web applications Comfortable working in cross-functional teams Ready to solve complex problems in a collaborative setting Interest in fintech and a drive to make an impact Location London, UK

About Allica BankAllica Bank is the UK's most rapidly expanding financial technology firm, dedicated to serving established SMEs—a crucial yet neglected segment in the fintech landscape. We aim to empower these businesses, which form the backbone of local economies, accounting for over a third of the economic output.Department OverviewOur Growth department plays a pivotal role at Allica, strategically positioned at the crossroads of marketing, product development, sales, and data analytics. This team is tasked with driving sustainable customer acquisition, engagement, and retention, ensuring our banking solutions effectively target and resonate with SMEs at critical junctures. We approach growth through a dual lens of science and art, leveraging commercial strategy along with in-depth customer insights.Role OverviewAs the Senior Manager of Conversion Rate Optimization & Experimentation, you will take full ownership of Allica's landing page ecosystem and conversion initiatives from end-to-end. This role is highly hands-on; you will analyze funnel data, develop clear hypotheses, and execute solutions directly—building and deploying landing pages, forms, calculators, and multi-step workflows within HubSpot CMS. You will harness AI tools like Claude and ChatGPT to enhance workflow efficiency. A strong commercial focus is paramount; you will measure your success not just by conversion rates but by tracking lead quality and downstream sales outcomes.Key ResponsibilitiesDevelop and manage a prioritized roadmap for conversion rate optimization and experimentation across Allica's primary customer acquisition channels, ensuring alignment with commercial objectives.Identify and analyze conversion bottlenecks pertaining to messaging, user experience, form design, trust signals, and page structure using analytics tools such as GA4, Heap, and HubSpot.Create structured experiments with defined hypotheses and measurement frameworks to drive continuous improvement in conversion performance.

About Wahed Technologies Wahed Technologies is working to make finance accessible and ethical for everyone. Many traditional financial systems rely on interest (riba), which can create obstacles for those who want to manage their money and build wealth while staying true to their values. The team at Wahed is building an entirely interest-free financial ecosystem. Their products include Shariah-compliant equity ETFs, riba-free high-yield savings alternatives, and real estate investments without leverage. Team members are based in locations around the world and share a commitment to making finance more inclusive. The company is looking for people who want to tackle complex problems and help create a fairer financial future.